If you never ever see anything at all on the screen this is almost certainly a hardware failure - this also fits with your description. It could be the charger unit or something internal. Unfortunately when faults arise on any piece of kit they have rarely happened before, so I'm afraid that doesn't tell us very much.

The information on Computing.Net is the opinions of its users. Such
opinions may not be accurate and they are to be used at your own risk.
Computing.Net cannot verify the validity of the statements made on this
site. Computing.Net and Compnet Ventures, LLC hereby disclaim all responsibility
and liability for the content of Computing.Net and its accuracy.